﻿/**
 * Copyright (C) 2013 original author and authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NGuice.Inject.Spi;

namespace NGuice.Inject.Internal
{
    //complete！
    /// <summary>
    /// 处理Binder.Provider和Binder.GetMemebersInjector(Type)命令
    /// </summary>
    internal sealed class LookupProcessor : AbstractProcessor
    {
        internal LookupProcessor(Errors errors)
            : base(errors)
        {
        }

        public override bool Visit<T>(MembersInjectorLookup<T> lookup)
        {
            try
            {
                IMembersInjector<T> membersInjector = injector.membersInjectorStore.Get<T>(lookup.Type, errors);
                lookup.InitializeDelegate(membersInjector);
            }
            catch (ErrorsException e)
            {
                errors.Merge(e.Errors); // TODO: source
            }

            return true;
        }

        public override bool Visit<T>(ProviderLookup<T> lookup)
        {
            // ensure the provider can be created
            try
            {
                IProvider<T> provider = injector.GetProviderOrThrow(lookup.Key, errors);
                lookup.InitializeDelegate(provider);
            }
            catch (ErrorsException e)
            {
                errors.Merge(e.Errors); // TODO: source
            }

            return true;
        }
    }
}
